Learning Design from Mature Coding Agents (30): MCP Integration — the Standard Socket for Tool Ecosystems
An MCP client must handle transports, tool refresh, approvals, and credential boundaries together. rivumi now supports allowlisted stdio, Streamable HTTP/SSE, tools/resources/prompts, tools/list_changed, OAuth metadata/PKCE, and a 0600 credential store. A real authorization-server E2E and MCP-specific confirmation UX remain open.